ci: add revs testing rustc 1.94.0 -Ztarget-spec-json requirement

Author: Firestar99

.github/workflows/push.yaml

@@ -98,6 +98,14 @@ jobs:
             glam-version: =0.30.7
           # after, glam >0.30.8
           - rust-gpu-version: e767f24f2565baf1a71bbaf84d453d181cab2417
+
+          # rustc 1.94.0 destabilised json target specs, requiring `-Ztarget-spec-json`
+          # see https://github.com/Rust-GPU/rust-gpu/pull/545
+          # see https://github.com/rust-lang/rust/pull/150151
+          # before
+          - rust-gpu-version: 30896871ba00e668029ccb724f1438202b284708
+          # after
+          - rust-gpu-version: 877bd8697a15f3e6d09446a5e1807e6237ca1dac
     runs-on: ubuntu-latest
     env:
       RUST_LOG: debug